Another requirement for this case is a hidden door latching mechanism.

Look Ma! No latches!

A length of .125x.75-inch flat bar was bolted to the bottom of the door to act as a lip that will hook into the u-channel along the bottom of the case, for example:

Along the top of the door, there is a piece of angle with three "hooks", which were routed out using a cobbled together router template.

A thick piece of flat bar was filed down to where it'll slide easily inside the u-channel along the top of the case. To that three "posts" were bolted to it. When slid forward, the posts will engage the hooks.

I made a mistake, placing the false back too far into the case, which required having to re-fabricate the back sheet. But I figured I could take advantage of the situation by improving the mounting of the motherboard tray, by fastening the tray to the false back with a 7/8-inch long spacer.

I don't remember if I already offered this tip before, but I try to reduce the wear and tear on my 1/2-inch flush cutting router bit by first rough cutting with a 3/16-inch spiral downward cutting bit.